@book {981,
	title = {Processamento Digital de Sinais},
	year = {2005},
	publisher = {Funda{\c c}{\~a}o Calouste Gulbenkian},
	organization = {Funda{\c c}{\~a}o Calouste Gulbenkian},
	address = {Lisboa},
	author = {Manuel D. Ortigueira}
}
